Obviously they have to simplify and make some assumptions if they aren't going to have a quiz that lasts ten hours and is more complicated to take than filing US Federal Taxes, lol.
It's not that hard to make adjustments for your special circumstances. Of course, it is going to be a very approximate estimate, even if the quiz itself were made much more complex and detailed.
But do write to the website if you have specific suggestions. They are always trying to improve it.
One obvious short-coming is not including how many children you have. But that would complicate matters since most teens aren't going to have any just because they haven't had the time or opportunity yet. And then should you count how late in life you had them? And whether you raised them vegetarian, etc.?
Another factor that should ultimately be figured in is how active you are in addressing the broader issue through education people, political activism, neighborhood organizing, etc. (We should also get a 'neven's-blog/forum-participant credit!
) But again, this would be a very difficult thing to factor in accurately and consistently.
I would say, take the quiz, fudge a bit on the aspects that don't apply, then give yourself some bonus points (or demerits) for factors not included in this necessarily limited test. But don't just assume that, since it can't be accurate, your actual footprint must be much better than what it shows. In general they are quite generous, and most people's actual footprints are likely much higher than what is shown.
(I'm also happy they don't count the amount of beer you drink against you. But then again, if I ever were to cut back a bit, I'd like to get some kind of credit for it! '-))
ETA: SkS just put out a timely post on carbon foot prints:
https://www.skepticalscience.com/Carbon-CO2-Footprint-Emissions-Calculator.htmlWhat’s your carbon footprint and where does it come from?In the CO2 calculator they link to:
http://ziemianarozdrozu.pl/apps/online/en/kalkulator.html# I do much better than my average American neighbor--9 vs 21 tons CO2/year--but that still comes to 9 carbon earths worth. Interesting that there is such a difference between the two. I'll have to check again, though. I think I over-estimated some things as I was converting to metric.